Clutch device



{No Model.)

J. 8v. T. E. PARVIN. GLUTGH DEVICE.

Patented Jan'. 2,'1883.

UNITED' STATES PATENT OFFICE.

JOHN PAHVIN AND THOMAS H. rAHvIN, or OAHMI, ILLINoIs.

SPECIFICATION forming part of Letters Patent No. 270,107, dated January2, ISES.

i Application filed June 6, 1882. (No model.)

To all whom it may concern Be it known that we, JOHN PARVIN and THOMASH. PARVIN, of Carini, White county, Illinois, have invented an ImprovedClutch Device, ot' which the following is a specification.

Our invention is a clutch device intended as a substitute for theordinary pawl and ratchet, and for imparting step-by-stepmovements fioma reciprocating device to a shaft or wheel; and our device consists ofan eccentric cylinder hung in arms turning on the shaft of a cylinder ordisk, and caused to bite the disk when moved in one direction by ahandlever, as fully described hereinafter, and

as illustrated in the accompanying drawings, in which Figure 1 is asectional elevation, showing our improved clutch device as applied to ashaft. Fig. 2 is a plan of Fig. the parts'differently arranged.

-Our improved device may be employed in most situations where it isdesired to convert a reciprocating into a step-by-step rotary motion, orin which an ordinary p'awl and ratchet can be used. lVe have illustratedit in the drawings in connectionwilh a shaft, A, which is to be turned,and a lever, B, by which the turning is to be effected. Ordinarily thedesired movement would be effected by means of a ratchet-wheel on theshaft and a. pawl pivoted to the lever; but this construction results inlost motion, and the ratchet-teeth are apt to break and the pawl to workloose. To avoid these difficulties, we substitute a cylinder or disk, a,for the ratchet-wheel and an eccentric, b, for the pawl. When aneccentric is used, as shown in Figs. l and 2, it isa plain cylindermounted eccentrically and immovably on a shaft, c, extending freelythrough arms d d', hung loosely on the shaft A, and through the lever B,so that the turning of the latter turns the eccentric b.

One of the arms, d', may be prolonged, as shown,.and the lever B maycarry a slide, e, which has lips i t' to receive between them the end ofthe arm d when it is desired to lock the latter to `the lever, in whichcase the eccentric is so turned as to be free from contact with theperiphery ofthe disk, when thelever B may swing freely round the shaft.

When it is desired to operate the shaft the slide e is raised to releasethe arm d', when pressure onthe lever in either direction will turn theeccentric and bringit forcibly against use a second clamp or clutch, 1J.

the. periphery of the. disk with such close frictional contact that thedisk and shaft will be carried with the lever.

The eccentric is so set that an extremely slight movement of the leverindependent of the arm d will cause the eccentric to bite the disk andinsure the desired motion.

Any desired locking device may he substituted for the slide e.

To prevent back motion of the shaft, wc may AS shown in Figs. l and 2,this clutch is an eccentric cylinder, p', on a shaft, g, carried by armsrr, swinging on the shat't`A, the cylinder being secured to a forkedlever, H, which rests on part of the frame, as shown. The turning of thelever H atan angle to the arms rturns the clutch-cylinder and makes itbite the disk, so that the latter cannot be moved except in thedirection of its arrow..

A stop, L, mounted movably on a curved bar, M, may serve to limit themovement of the lever B. This stop consists ot' a block having anopening to receive the bar, and slit to receive the cam or eccentrichead of a lever, s, hung to a pin, t. By turning the lever l the headmay be caused to bite the barfirmly,

stop.

We claiml. A clutch device consisting of a shaft carrying a disk, aclutclrcylinder hung between arms arranged to swing round the shaft, anda hand-lever connected to said cylinder, all as set forth.

2. The combination of the shaft A, disk a, eccentric cylinder, lever B,connected to the cylinder, arms carrying the cylinder, and lock devicesWnereby the lever may be locked to one ofthe arms orreleased,.substantially as set forth. o l

3. The combination of the shaft A, disk a, eccentric I, lever B, andlever H, carrying a clutch device, substantially as specified.

4. The combination of the shaft, disk, ec-

I oo centric, and lever B., of the arms r r, eccentric 1)', and lever H,as speciled.

In testimony whereof we have signed our names to this specication in thepresence of two subscribing witnesses.

JOHN PAR'VIN. I THOMAS H. PARVIN. Vitnesses:

GHAUNCEY S. CONGEH, HAIL STORMS.

